GB927298A - Thermionic valve cathode - Google Patents

Thermionic valve cathode

Info

Publication number
GB927298A
GB927298A GB1133361A GB1133361A GB927298A GB 927298 A GB927298 A GB 927298A GB 1133361 A GB1133361 A GB 1133361A GB 1133361 A GB1133361 A GB 1133361A GB 927298 A GB927298 A GB 927298A
Authority
GB
United Kingdom
Prior art keywords
spacer
overwinding
march
heater
insulating material
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB1133361A
Inventor
Frederic William Rodbar Farrow
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Associated Electrical Industries Ltd
Original Assignee
Associated Electrical Industries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Associated Electrical Industries Ltd filed Critical Associated Electrical Industries Ltd
Priority to GB1133361A priority Critical patent/GB927298A/en
Priority to FR892567A priority patent/FR1321053A/en
Publication of GB927298A publication Critical patent/GB927298A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J1/00—Details of electrodes, of magnetic control means, of screens, or of the mounting or spacing thereof, common to two or more basic types of discharge tubes or lamps
    • H01J1/02—Main electrodes
    • H01J1/13—Solid thermionic cathodes
    • H01J1/20—Cathodes heated indirectly by an electric current; Cathodes heated by electron or ion bombardment
    • H01J1/22—Heaters

Landscapes

  • Solid Thermionic Cathode (AREA)
  • Electrodes For Cathode-Ray Tubes (AREA)

Abstract

927,298. Indirectly-heated cathodes. ASSOCIATED ELECTRICAL INDUSTRIES Ltd. March 5, 1962 [March 28, 1961], No. 11333/61. Class 39 (1). The heater 2 of an indirectly heated cathode is spaced from the emissive sleeve 1 by a cored spacer 3 of refractory insulating material in the form of an open helical coil embracing the heater, which spacer is shaped to have a protuberance 4 helically circumscribing its surface. The spacer may be formed by overwinding a tungsten core 5 with a molybdenum wire, and forming the overwound core into a helix, which is then coated with insulating material by electrophoresis, dipping or spraying followed by sintering. The molybdenum overwinding may then be removed by etching in a bath comprising equal parts by volume of concentrated nitric acid, sulphuric acid and water, to leave a hollow protuberance. Specification 847,019 is referred to.
GB1133361A 1961-03-28 1961-03-28 Thermionic valve cathode Expired GB927298A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB1133361A GB927298A (en) 1961-03-28 1961-03-28 Thermionic valve cathode
FR892567A FR1321053A (en) 1961-03-28 1962-03-28 Electron tube cathode

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1133361A GB927298A (en) 1961-03-28 1961-03-28 Thermionic valve cathode

Publications (1)

Publication Number Publication Date
GB927298A true GB927298A (en) 1963-05-29

Family

ID=9984323

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1133361A Expired GB927298A (en) 1961-03-28 1961-03-28 Thermionic valve cathode

Country Status (1)

Country Link
GB (1) GB927298A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3740606A (en) * 1971-09-01 1973-06-19 Gte Sylvania Inc Vibration suppressor in cathode assembly for electron discharge device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3740606A (en) * 1971-09-01 1973-06-19 Gte Sylvania Inc Vibration suppressor in cathode assembly for electron discharge device

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